During three separate visits to Atlanta's Georgia Aquarium last month, the actors, in town filming Hunger Games: Catching Fire, were treated to exclusive meet-and-greets with marine mammals.

On Oct. 14, Lawrence donned a wetsuit to swim with whale sharks, manta rays and zebra sharks at the Journey with Gentle Giants exhibit. While she was instructed not to touch the creatures, she swam the perimeter and got up close and personal with several whale sharks.

A few days earlier, on Oct. 11, Harrelson was all smiles when he shook fins with one of the aquarium's Atlantic bottlenose dolphins. After a tour, Harrelson, wife Laura Louie and two of their children walked through Ocean Voyager, an exhibit specially designed to house whale sharks, the largest fish species in the world.

Banks turned Oct. 16 into a family day when she took her husband, Max Handelman, and their 1-year-old son Felix to the aquarium. They took in a dolphin show and got an exclusive behind-the-scenes tour where Banks was excited for her son to see all of the underwater dwellers.